TY - CPAPER TI - Development and Validation of a Test Instrument for Assessing Functional Thinking in Secondary Education AU - Greefrath, Gilbert AU - Bommert, Emilia AU - Kirsten, Katharina T2 - Proceedings of the International Group for the Psychology of Mathematics Education, Volume 1 PB - Psychology of Mathematics Education (PME) PY - 2026 SP - 531 EP - 538 SN - 2790-3648 KW - functional thinking KW - test instrument KW - three-dimensional model UR - https://www.igpme.org/publications/RR_PME49/rr/greefrath-development-and-validation-of-a-test-instrument-for-assessin/ ER -